The example of non-ohmic resistance is

diode

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copper wire

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filament lamp

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carbon resistor

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Solution

The correct options are
A diode
C filament lamp
The diode does not obey the Ohm's law. The expression of current is given by
$I = I_{0} (e^{\frac{q V}{k T}} - 1)$ . Thus, $V v s I$ curve is not a straight line. hence, the diode is non-ohmic. copper wire, filament lamp and carbon resistor are all ohmic resistances. Hence correct option is A and C

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